Noun:
a cavity or space in something;hunger had caused the hollows in their cheeks
a small valley between mountains;he built himself a cabin in a hollow high up in the Appalachians
a depression hollowed out of solid matter
Adjective:
not solid; having a space or gap or cavity;a hollow wall
a hollow tree
hollow cheeks
his face became gaunter and more hollow with each year
as if echoing in a hollow space;the hollow sound of footsteps in the empty ballroom
devoid of significance or point;empty promises
a hollow victory
vacuous comments
Verb:
remove the inner part or the core of;the mining company wants to excavate the hillside
remove the interior of;hollow out a tree trunk
n.名词
hollow, den, hole这组词都有“孔,洞,穴”的意思。其区别在于:hole可指正常的“洞,洞穴”,也可指不正常的“破洞,裂口”; hollow主要指凹地、洼地或任何物体的“凹陷部分”,如洞、穴、坑等; den特指“兽穴”,也指动物园中的“兽笼”,有时也可指“匪窝”等。例如:
We got into the cellar through a round hole covered by a metalplate.我们从一个有金属盖板的圆洞进入地 下室。
More gravel is needed to fill the hollow in the driveway.在车道的凹地上需要填更多的沙砾。
The policeman happened to find a den of thieves in the suburb of the city.警察在市郊发现了一个贼窝。empty，vacant，hollow这一组词都表示“空的”，但涵义有所不同。
empty意思是“里面没有东西”、“一无所有”，具有“空无一物”的隐含意义，它可以用来描绘box、vessel、cupboard、bag、purse、room、house、street、stomach、head 等词。
vacant意思是“闲着的”、“无人占据的”，着重指临时性的情况，如：vacant seat、vacant apartment、vacant position等。
hollow意思是“空心的”、“中空的”、“空洞的”、“下陷的”，它常与tree、ball、cheeks、voice、sound、words、promise等词连用，由此可见，它既可用以指实物的“中空”，亦可指 words、promise、compliments的“虚假”，用于后者场合是比喻意义。
用作形容词 adj.
～+名词hollow pipe空心管子hollow words空洞的言语hollow laugh虚伪的笑hollow promises虚伪的允诺
近义词 pit坑dig挖hole洞bowl碗shell壳cup杯子void空的deep深的cavity洞empty空的false假的scoop铲子pan平底锅valley山谷bare赤裸的recess休息tunnel隧道null无效的well很好地vain自负的holler叫喊blank空白的concave凹的dig out挖出vacancy空缺opening开口vacuous空的vacant空虚的barren贫瘠的sunken沉没的hungry饥饿的excavate挖掘cavern大洞穴starved饥饿的ravenous贪婪的unreal不真实的depression沮丧hollow out挖空gouge用圆凿子挖depressed沮丧的deceptive骗人的famished极饥饿的insincere不真诚的hypocritical伪善的crater坑陨石坑、弹坑等…反义词 solid固体的
用作形容词adj.
用作定语
～+ n.Bamboo is a sort of hollow plant.竹子是一种中空的植物。
He has hollow cheeks.他的双颊凹陷。
The divorce left him with a hollow feeling inside.离婚使他内心感到空虚。
用作表语
S+be+～A bar of iron is solid;a pipe is hollow.铁棍是实心的，而管子是空心的。
A drum is hollow.鼓是空心的。
The words you say are very hollow.你讲的话很空洞。
He declared that he was telling the truth, but his words rang hollow.他自称说的都是真话,但听起来不像真的。
His promises are hollow.他的许诺是假的。用作名词n.The hollow was full of trees but the higher ground was covered with grass.凹地树木成林，但高处长满青草。
形容词52%,动词45%,名词3%
He was thin and his cheeks were hollow.他很瘦,连面颊都凹陷了下去。用作名词用作及物动词The Indians used to hollow out a log to make a canoe.印第安人过去常挖空圆木制成独木舟。用作副词⎤